Improved adjustable scaffold



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Letters Patent No. 93,019, dated July 27, 1869.

IMPRC'VED ADJUSTABLE SCAFIOLD.

The Schedule referred to in these Letters Patent and making part of the same.

To alll whom it may con'cem:

Be it known that we, FRANCIS STEIN and HENRY HAERING, of the city of New York, in the county and State of New York, have inventeda new and improved Portable and Adjustable Scaffold; and we do hereby declare that the following is a full, clear, and exact description thereof, which will enable -others skilled in the art to make and use the same, reference being had to the accompanying drawing, forming part of this specication.

Our invention has for its object an improved oonstruction of scaffolds of the kind, which is adjustable vertically independent of the walls, 85e., of buildings; and

It consists in the construction, arrangement, and

combination of parts, as will be hereinafter fully set forth.

Figure 1 represents a' plan view of a foundationframe.A

Figure 2 represents a sectional elevation of the foundation andthe carriage.

Figure 3 represents a section takeiiin a plane parallel with that of fig. 2.

Similar letters of reference indicate corresponding parts.

The foundation A. may be made in any preferred way to support a strong metallic socket, B, for the post C, which we provi-de with a rounded corner at D, to facilitate hoisting in and out of the supportingsocket, the o bject being to separate the parts for removal in a convenient manner.

In this instance, we have represented a platform composed of parallel timbers, resting at'each end on tie-s E, and a circular metallic ring, F; -snpporting the socket at the centre, and clamped to the `timbers by hooks G, engaging with a slotted bar, H, under the timbers and screwed up by nuts I.

We place on each side of the post Hat metal bars, K, both for strengthening the posts and for the edges thereof, to form tracks for the rollers L of a carriage, M, arranged on the posts, to be moved up and down thereon by a toothed pinion, N, taking into a. toothed rack, O, on the post, and operated by a hand-crank,

P, through suitable reducing-gears, as shown at Q, fig. 3. o v A On the shaft of the pinion N and the large reducingwheel is placed a,:,ratchetwheel-, R, into which pawls S T take' to hold the carriage. V

U represents a brake-strap, secured to the carriage 'at Y, and ,passed around a large hub, W; also, on the axlelofthe pinion N, to a brake-lever, X, pivoted to the 'carriage at Y.

' This lever is provided with a projection, a, taking under a stud on the end of the pawl T; also, with an arm, b, taking under the pawl S, so arranged that when the lever is pressed back to apply the brake-strap the said pawls will be thrown out of connection with the ratchet-wheel, to allow the carriage to descend, which it Will do if the weight be suicient to overcome the friction. If not, the carriage may be forced down by the cranks.

From this carriage are suspended brackets, Z, for supporting the flooring, which may extend from the brackets of one carriage to those of another, supported on another -post at the proper distance, and as many of these devices may be arranged along the Walls of building as required.

Having thus described our invention,

What we claim as new, and desire to secure by Let`v 1. The friction-wheels L L, arranged with relation to the post C and case A, as and for the purpose set forth.

2. The metallic wheel or ring F, supporting the socket B, combined with the platform A, substantially as specified.

3. The combination, with the ratchet-wheel, pinion N, and rack O, of the pawls, brake, and lever, when arranged substantially as specified.

. The above specification of our invention signed by us, this 20th day of March, 1869. o, FRANCIS STEIN. H. HAERING. Witnesses:

FRANK BLocKLnY, ALEX. F. ROBERTS. 

